nv50/ir: silence partitionLoadStore() unused function warning

nv50/ir: silence partitionLoadStore() unused function warning

Move this now-unused function into the existing comment block, which was its only prior use.

../../../../../src/gallium/drivers/nouveau/codegen/nv50_ir_from_tgsi.cpp:2645:1: warning:
      unused function 'partitionLoadStore' [-Wunused-function]
partitionLoadStore(uint8_t comp[2], uint8_t size[2], uint8_t mask)

Fixes: ("86e4440361 nouveau: codegen: Disable more old resource handling code")
Signed-off-by: Rhys Kidd <rhyskidd@gmail.com>
Reviewed-by: Ilia Mirkin <imirkin@alum.mit.edu>